javascript - 获取对象内所有数组的二维数组
问题描述
我正在尝试将对象中的所有数组放入单独的二维数组中,但是在函数的递归性质方面遇到了麻烦。我能够得到所有的数组,但是我写它的方式,我得到了我不想要的多层嵌套。
下面的代码返回
[
["1-1","1-2","1-3"],
[
["2-1","2-2","2-3"]
],
[
[
["3-1","3-2","3-3"]
]
],
[
[
["4-1-1","4-1-2","4-1-3"],
[
["4-2-1-1","4-2-1-2","4-2-1-3"],
["4-2-2-1","4-2-2-2","4-2-2-3"]
]
]
]
]
无论对象内的嵌套如何,如何修改getArrays()
函数以返回二维数组?
function testGetArrays() {
var testObject = {
"one": ["1-1", "1-2", "1-3"],
"two": {
"first": ["2-1", "2-2", "2-3"]
},
"three": {
"first": {
"second": ["3-1", "3-2", "3-3"]
}
},
"four": {
"first": {
"first": ["4-1-1", "4-1-2", "4-1-3"],
"second": {
"first": ["4-2-1-1", "4-2-1-2", "4-2-1-3"],
"second": ["4-2-2-1", "4-2-2-2", "4-2-2-3"]
}
}
}
};
var expectedResult = [
["1-1", "1-2", "1-3"],
["2-1", "2-2", "2-3"],
["3-1", "3-2", "3-3"],
["4-1-1", "4-1-2", "4-1-3"],
["4-2-1-1", "4-2-1-2", "4-2-1-3"],
["4-2-2-1", "4-2-2-2", "4-2-2-3"]
];
var result = getArrays(testObject);
console.log(JSON.stringify(expectedResult) == JSON.stringify(result));
console.log(JSON.stringify(result));
}
function getArrays(object) {
var result = [];
if (Array.isArray(object)) {
if (Array.isArray(object[0])) {
result.push(getArrays(object[0]));
}
result.push(object);
} else {
for (var i in object) {
current = object[i];
if (Array.isArray(current)) {
result.push(current);
} else {
var x = getArrays(current);
result.push(x);
}
}
}
return result;
}
解决方案
最简单的调整是给getArrays
另一个参数, the result
,它在第一次调用时被初始化为一个空数组,然后递归地传递和变异:
testGetArrays();
function testGetArrays() {
var testObject = {
"one": ["1-1", "1-2", "1-3"],
"two": {
"first": ["2-1", "2-2", "2-3"]
},
"three": {
"first": {
"second": ["3-1", "3-2", "3-3"]
}
},
"four": {
"first": {
"first": ["4-1-1", "4-1-2", "4-1-3"],
"second": {
"first": ["4-2-1-1", "4-2-1-2", "4-2-1-3"],
"second": ["4-2-2-1", "4-2-2-2", "4-2-2-3"]
}
}
}
};
var expectedResult = [
["1-1", "1-2", "1-3"],
["2-1", "2-2", "2-3"],
["3-1", "3-2", "3-3"],
["4-1-1", "4-1-2", "4-1-3"],
["4-2-1-1", "4-2-1-2", "4-2-1-3"],
["4-2-2-1", "4-2-2-2", "4-2-2-3"]
];
var result = getArrays(testObject);
console.log(JSON.stringify(expectedResult) == JSON.stringify(result));
console.log(JSON.stringify(result));
console.log(result);
}
function getArrays(object, result = []) {
if (Array.isArray(object)) {
if (Array.isArray(object[0])) {
result.push(getArrays(object[0]));
}
result.push(object);
} else {
for (var i in object) {
current = object[i];
if (Array.isArray(current)) {
result.push(current);
} else {
getArrays(current, result);
}
}
}
return result;
}